Use override in more classes in fpdfsdk/

fpdfsdk/include/javascript/util.h

Index: fpdfsdk/include/javascript/util.h
diff --git a/fpdfsdk/include/javascript/util.h b/fpdfsdk/include/javascript/util.h
index 2e65bd3f580feb732cc67aca213bbab86cc9bf62..369985673ad5103cb351e72e96b68a3ae0a5c8c4 100644
--- a/fpdfsdk/include/javascript/util.h
+++ b/fpdfsdk/include/javascript/util.h
@@ -14,7 +14,7 @@
 class util : public CJS_EmbedObj {
  public:
   util(CJS_Object* pJSObject);
-  virtual ~util(void);
+  ~util() override;
 
  public:
   FX_BOOL printd(IFXJS_Context* cc,
@@ -51,8 +51,8 @@ class util : public CJS_EmbedObj {
 
 class CJS_Util : public CJS_Object {
  public:
-  CJS_Util(JSFXObject pObject) : CJS_Object(pObject){};
-  virtual ~CJS_Util(void){};
+  CJS_Util(JSFXObject pObject) : CJS_Object(pObject) {}
+  ~CJS_Util() override {}
 
   DECLARE_JS_CLASS(CJS_Util);